The Durlans eventually have a much more public character in Chameleon Boy of the Legion of Superheroes, but they've remained a mysterious part of the DC Universe, occasionally tapped to play the role of villain in several broad storyarcs, but we prefer the idea of them being completely isolationist until Chameleon Boy challenges that idea in the 30th century.

meanwhile, This allows the mysterious character the Durlan to be a mentor and teacher to Vril Dox. By smuggling himself on Vril's person to escape Brainiac's labs, he can be there from the very beginning with Vril, helping him learn to become the character he grows into, using his vast intellect and the emotional disconnect that comes from being a clone of brainiac to make the hard choices that allow him to eventually forge L.E.G.I.O.N. He becomes a sort of father figure to Dox, which is why his death leads him to ally his L.E.G.I.O.N. forces with Adam Strange's Omega Men.